Method and Apparatus for Performing User Equipment Autonomous Resource Reselection Based on Counter in Wireless Communication System

1. A method performed by a wireless device in a wireless communication system, the method comprising: based on a media access control (MAC) entity of the wireless device being configured by an upper layer to transmit using a pool of resources, determining that there is data in a logical channel; determining that a value of sidelink resource reselection counter is zero; selecting, from the pool of resources, sidelink resources based on the value of the sidelink resource reselection counter being zero; and transmitting the data based on the selected sidelink resources, wherein the value of the sidelink resource reselection counter is decreased by 1 upon that a hybrid automatic repeat request (HARQ) transmission of the sidelink transmission is completed.

2. The method of claim 1 , wherein selecting the sidelink resources comprises: randomly selecting a value between 5 and 15 with equal probability for the sidelink resource reselection counter; and setting the value of the sidelink resource reselection counter to the selected value.

3. The method of claim 1 , wherein selecting the sidelink resources comprises: determining a number of HARQ retransmissions within a range configured by the upper layer.

4. The method of claim 1 , wherein selecting the sidelink resources comprises: determining an amount of frequency resources within a range configured by the upper layer.

5. The method of claim 1 , wherein selecting the sidelink resources is performed for each sidelink logical channel.

6. The method of claim 1 , wherein selecting the sidelink resource is performed based on sensing using the pool of resources.

7. The method of claim 1 , wherein the pool of resources does not include resources excluded by a physical layer according to a delay requirement of a vehicle-to-everything (V2X) communication.

8. The method of claim 7 , wherein the resources excluded by the physical layer are determined according to a maximum allowed physical sidelink shared channel (PSSCH) transmission time.

9. The method of claim 1 , wherein the upper layer is a radio resource control (RRC) layer of the wireless device.

10. The method of claim 1 , wherein the wireless device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the wireless device.

11. A wireless device configured to operate in a wireless communication system, the wireless device comprising: a transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations that comprise: based on a media access control (MAC) entity of the wireless device being configured by an upper layer to transmit using a pool of resources, determining that there is data in a logical channel; determining that a value of sidelink resource reselection counter is zero; selecting, from the pool of resources, sidelink resources based the value of the sidelink resource reselection counter being zero; and transmitting the data based on the selected sidelink resources, wherein the value of the sidelink resource reselection counter is decreased by 1 upon that a hybrid automatic repeat request (HARQ) transmission of the sidelink transmission is completed.

12. A processor for a wireless device in a wireless communication system, wherein the processor is configured to control the wireless device to: based on a media access control (MAC) entity of the wireless device being configured by an upper layer to transmit using a pool of resources, determine that there is data in a logical channel; determine that a value of sidelink resource reselection counter is zero; select, from the pool of resources, sidelink resources based the value of the sidelink resource reselection counter being zero; and transmit the data based on the selected sidelink resources, wherein the value of the sidelink resource reselection counter is decreased by 1 upon that a hybrid automatic repeat request (HARQ) transmission of the sidelink transmission is completed.